CVE-2016-4587: WebKit in Apple iOS before 9.3.3 and tvOS before 9.2.2 allows remote attackers to obtain sensitive information

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MEDIUM 6.5MITIGATE

CVE-2016-4587 is a medium-severity flaw (CVSS 6.5) affecting webkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WebKit in Apple iOS before 9.3.3 and tvOS before 9.2.2 allows remote attackers to obtain sensitive information from uninitialized process memory via a crafted web site.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-119
Published	2016-07-22
Last modified	2026-06-17

Publisher (CNA): Apple Inc. · Vendor: apple

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-07-22 02:59 UTCPublished CVE record published
2026-06-17 00:47 UTCUpdated Record last modified

apple webkit MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webkit || rpm -q webkit || webkit --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-4587?

webkit: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-4587 being exploited?

CVE-2016-4587 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-4587 affect?

CVE-2016-4587 affects webkit. Severity is medium (CVSS 6.5). WebKit in Apple iOS before 9.3.3 and tvOS before 9.2.2 allows remote attackers to obtain sensitive information from uninitialized process memory via a crafted web site.

How urgent is CVE-2016-4587?

Priority 43/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities · tvOS vulnerabilities

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References

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